You're correct that nothing can move instantaneously, at a maximum it's bounded by the speed of sound in the material. But can you detect a 0.2ms delay? Probabl

You're correct that nothing can move instantaneously, at a maximum it's bounded by the speed of sound in the material. But can you detect a 0.2ms delay? Probably no human can. What about a 2ms delay? Potentially some people can. What about a 20ms delay? Probably, although it's still very small. Perhaps saying that the wheels move "exactly" as the driver intends in a rack and pinion system is too absolute, but if you can't see or feel this delay then I'd argue that to the human driving it's irrelevant. You can see the lag in the video, which admittedly is slowed down, but if we assume the original frame rate was 60fps then there's a minimum of a 16.7ms lag and I'd estimate it's at least 3-4 frames so more like 50.0-66.7ms, which is absolutely noticeable. Why should we accept performance which is clearly worse than a mechanical system? This is a delay that exists on top of all the other factors you've mentioned, not in lieu of them. It casts doubts on the functional safety of the system.